COERCIBILITY

Syntax

COERCIBILITY(str)

Description

Returns the collation coercibility value of the string argument. Coercibility defines what will be converted to what in case of collation conflict, with an expression with higher coercibility being converted to the collation of an expression with lower coercibility.

Coercibility	Description	Example
0	Explicit	Value using a COLLATE clause
1	No collation	Concatenated strings using different collations
2	Implicit	Column value
3	Constant	USER() return value
4	Coercible	Literal string
5	Ignorable	NULL or derived from NULL

Examples

SELECT COERCIBILITY('abc' COLLATE latin1_swedish_ci);
+-----------------------------------------------+
| COERCIBILITY('abc' COLLATE latin1_swedish_ci) |
+-----------------------------------------------+
|                                             0 |
+-----------------------------------------------+

SELECT COERCIBILITY(USER());
+----------------------+
| COERCIBILITY(USER()) |
+----------------------+
|                    3 |
+----------------------+

SELECT COERCIBILITY('abc');
+---------------------+
| COERCIBILITY('abc') |
+---------------------+
|                   4 |
+---------------------+

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https://mariadb.com/kb/en/coercibility/